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Hardware Reference
3.4
Console Serial Port
The console serial port on the IQ80960RM/RN platform, based on a 16C550 UART, is capable of
operation from 300 to 115,200 bps. The port is connected to a phone jack-style plug on the
IQ80960RM/RN platform. The DB25 to RJ-45 cable included with the IQ80960RM/RN can be
used to connect the console port to any standard RS-232 port on the host system.
The UART on the IQ80960RM/RN platform is clocked with a 1.843 MHz clock, and may be
programmed to use this clock with its internal baud rate counters. The UART register addresses are
shown in
and device operation. Note that some UART addresses refer to different registers depending on
whether a read or a write is being performed.
Table 3-5.
UART Register Addresses
3.5
Secondary PCI Bus Expansion Connectors
Four PCI Expansion Slots are available on the IQ80960RM/RN platform. The IQ80960RM
supports 32-bit PCI expansion and the IQ80960RN supports 64-bit PCI expansion. The slots are
designed for +5V PCI signalling and accommodate PCI cards with +5V or universal signalling
capabilities.
3.5.1
PCI Slots Power Availability
Power from the Primary PCI bus, +3.3V, +5V, +12V, and –12V, is routed to the Secondary PCI
bus expansion slots. +3.3V is only available at the secondary PCI slots if the host system makes
+3.3V available on the Primary PCI slots. LED CR5 indicates if this power is available.
3-4
Table
3-5; refer to the 16C550 device data book for a detailed description of the registers
Address
E000 0000H
Receive Holding Register
E000 0001H
Unused
E000 0002H
Interrupt Status Register
E000 0003H
Unused
E000 0014H
Unused
E000 0015H
Line Status Register
E000 0016H
Modem Status Register
E000 0017H
Scratchpad Register
Read Register
Transmit Holding Register
Interrupt Enable Register
FIFO Control Register
Line Control Register
Modem Control Register
Unused
Unused
Scratchpad Register
IQ80960RM/RN Evaluation Board Manual
Write Register
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